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authorZidan Wang <zidan.wang@freescale.com>2015-07-23 11:40:49 +0800
committerVinod Koul <vinod.koul@intel.com>2015-08-19 21:28:55 +0530
commitd078cd1b4185134fe861e2b16a40ba14efb307b7 (patch)
treeafd375b22c6a533c77ef61cce371bcbc148a2c38 /drivers/dma
parente900c30dc1bb0cbc07708e9be1188f531632b2ef (diff)
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dmaengine: imx-sdma: Add imx6sx platform support
The new Solo X has more requirements for SDMA events. So it creates a event mux to remap most of event numbers in GPR (General Purpose Register). If we want to use SDMA support for those module who do not get the even number as default, we need to configure GPR first. Thus this patch adds this support of GPR event remapping configuration to the SDMA driver. Signed-off-by: Zidan Wang <zidan.wang@freescale.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/imx-sdma.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 34dece3af192..acf1e2f0c23c 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -42,6 +42,9 @@
#include <asm/irq.h>
#include <linux/platform_data/dma-imx-sdma.h>
#include <linux/platform_data/dma-imx.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include "dmaengine.h"
@@ -1447,6 +1450,72 @@ err_firmware:
release_firmware(fw);
}
+#define EVENT_REMAP_CELLS 3
+
+static int __init sdma_event_remap(struct sdma_engine *sdma)
+{
+ struct device_node *np = sdma->dev->of_node;
+ struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0);
+ struct property *event_remap;
+ struct regmap *gpr;
+ char propname[] = "fsl,sdma-event-remap";
+ u32 reg, val, shift, num_map, i;
+ int ret = 0;
+
+ if (IS_ERR(np) || IS_ERR(gpr_np))
+ goto out;
+
+ event_remap = of_find_property(np, propname, NULL);
+ num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0;
+ if (!num_map) {
+ dev_warn(sdma->dev, "no event needs to be remapped\n");
+ goto out;
+ } else if (num_map % EVENT_REMAP_CELLS) {
+ dev_err(sdma->dev, "the property %s must modulo %d\n",
+ propname, EVENT_REMAP_CELLS);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ gpr = syscon_node_to_regmap(gpr_np);
+ if (IS_ERR(gpr)) {
+ dev_err(sdma->dev, "failed to get gpr regmap\n");
+ ret = PTR_ERR(gpr);
+ goto out;
+ }
+
+ for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) {
+ ret = of_property_read_u32_index(np, propname, i, &reg);
+ if (ret) {
+ dev_err(sdma->dev, "failed to read property %s index %d\n",
+ propname, i);
+ goto out;
+ }
+
+ ret = of_property_read_u32_index(np, propname, i + 1, &shift);
+ if (ret) {
+ dev_err(sdma->dev, "failed to read property %s index %d\n",
+ propname, i + 1);
+ goto out;
+ }
+
+ ret = of_property_read_u32_index(np, propname, i + 2, &val);
+ if (ret) {
+ dev_err(sdma->dev, "failed to read property %s index %d\n",
+ propname, i + 2);
+ goto out;
+ }
+
+ regmap_update_bits(gpr, reg, BIT(shift), val << shift);
+ }
+
+out:
+ if (!IS_ERR(gpr_np))
+ of_node_put(gpr_np);
+
+ return ret;
+}
+
static int sdma_get_firmware(struct sdma_engine *sdma,
const char *fw_name)
{
@@ -1671,6 +1740,10 @@ static int sdma_probe(struct platform_device *pdev)
if (ret)
goto err_init;
+ ret = sdma_event_remap(sdma);
+ if (ret)
+ goto err_init;
+
if (sdma->drvdata->script_addrs)
sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
if (pdata && pdata->script_addrs)